Yes, I have forfeited a couple of tickets when I was unable at a late stage (it doesn't matter what stage- you still cannot cancel or change) to make the flight. And I work in the industry! It is normal! The only way you can get your money back is if you are travel insured and there is a medical/personal emergency covered under the terms of your travel insurance. Even then it is not assured. But the airline will not, under almost any circumstances, refund you....ever. That's how it is.